diff --git a/plone/formwidget/captcha/configure.zcml b/plone/formwidget/captcha/configure.zcml
index f395f7a..a3a1c28 100644
--- a/plone/formwidget/captcha/configure.zcml
+++ b/plone/formwidget/captcha/configure.zcml
@@ -40,6 +40,11 @@
         provides="Products.GenericSetup.interfaces.EXTENSION"
         />
 
+    <!-- Validators -->
+    <adapter
+        factory=".validator.CaptchaValidator"
+        />
+
     <!--
     example:
     http://yourplonesite/@@captcha_form
diff --git a/plone/formwidget/captcha/validator.py b/plone/formwidget/captcha/validator.py
new file mode 100644
index 0000000..5d72637
--- /dev/null
+++ b/plone/formwidget/captcha/validator.py
@@ -0,0 +1,30 @@
+from Acquisition import aq_inner
+
+from z3c.form import validator
+
+from z3c.form.interfaces import IValidator
+
+from zope.component import getMultiAdapter, provideAdapter
+
+from zope.schema import ValidationError
+
+from plone.formwidget.captcha import CaptchaMessageFactory as _
+
+class WrongCaptchaCode(ValidationError):
+    __doc__ = _("""The code you entered was wrong, please enter the new one.""")
+
+class CaptchaValidator(validator.SimpleFieldValidator):
+
+    def validate(self, value):
+        super(CaptchaValidator, self).validate(value)
+        captcha = getMultiAdapter((aq_inner(self.context), self.request), name='captcha')
+        if value:
+            if not captcha.verify(value):
+                raise WrongCaptchaCode
+            else:
+                return True
+        raise WrongCaptchaCode
+
+from plone.formwidget.captcha.demo.form import ICaptchaForm
+validator.WidgetValidatorDiscriminators(CaptchaValidator, field=ICaptchaForm['captcha'])
+provideAdapter(CaptchaValidator)
\ No newline at end of file